Autor: |
Marco Giola, Giovanni Consolati, Mario Mariani, Armando Buttafava, Ugo Ravasio, Antonio Faucitano |
Rok vydání: |
2007 |
Předmět: |
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Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 265:245-250 |
ISSN: |
0168-583X |
Popis: |
The effect of gamma irradiation in air is investigated in two thermoplastic polyesters (PET and PEN), in order to evaluate the influence of aromatic density and the role of oxygen on radiation resistance. EPR measurements were carried out to detect radical stability against oxygen permeation and to provide radical characterization. Viscometric data reveal a different behaviour between films and thick samples. Positron annihilation spectra show a decrease of ortho-positronium intensity, which is more marked in film samples. ortho-positronium lifetime does not depend on the radiation dose. |
Databáze: |
OpenAIRE |
Externí odkaz: |
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